package com.garygyp.eduservice.service.impl;

import com.alibaba.excel.EasyExcel;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.garygyp.eduservice.entity.EduSubject;
import com.garygyp.eduservice.entity.excel.SubjectData;
import com.garygyp.eduservice.entity.subject.OneSubject;
import com.garygyp.eduservice.entity.subject.TwoSubject;
import com.garygyp.eduservice.listener.SubjectExcelListener;
import com.garygyp.eduservice.mapper.EduSubjectMapper;
import com.garygyp.eduservice.service.EduSubjectService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 课程科目 服务实现类
 * </p>
 *
 * @author GaryGyp
 * @since 2022-05-10
 */
@Service
public class EduSubjectServiceImpl extends ServiceImpl<EduSubjectMapper, EduSubject> implements EduSubjectService {
    // 添加课程分类
    @Override
    public void saveSubject(MultipartFile file, EduSubjectService subjectService) {
        try {
            // 文件输入流
            InputStream in = file.getInputStream();
            // 调用方法进行读取
            EasyExcel.read(in, SubjectData.class, new SubjectExcelListener(subjectService)).sheet().doRead();
        } catch (Exception e) {
        }
    }

    // 课程分类列表（树形）
    @Override
    public List<OneSubject> getAllOneTwoSubject() {

        // 1. 查询所有一级分类   parentId == "0"
        QueryWrapper<EduSubject> wrapperOne = new QueryWrapper<>();
        wrapperOne.eq("parent_id", "0");
        List<EduSubject> oneSubjectList = baseMapper.selectList(wrapperOne);

        // 2. 查询所有二级分类   parentId != "0"
        QueryWrapper<EduSubject> wrapperTwo = new QueryWrapper<>();
        wrapperTwo.ne("parent_id", "0");
        List<EduSubject> twoSubjectList = baseMapper.selectList(wrapperTwo);

        // 创建list集合，用于存储最终封装数据
        List<OneSubject> finalSubjectList = new ArrayList<>();

        // 3. 封装所有一级分类
        // 将查询出来所有的一级分类list集合遍历，得到每一个一级分类对象，获取每一个一级分类对象值，
        // 封装到要求list集合里面List<OneSubject> finalSubjectList
        for (int i = 0; i < oneSubjectList.size(); i++) {
            // 得到oneSubjectList每个eduSubject对象
            EduSubject eduSubject = oneSubjectList.get(i);

            // 把eduSubject里面的值取出来放到OneSubject对象里面
            // 多个OneSubject放到finalSubjectList里面
            OneSubject oneSubject = new OneSubject();
//            oneSubject.setId(eduSubject.getId());
//            oneSubject.setTitle(eduSubject.getTitle());
            // 简化如下：
            BeanUtils.copyProperties(eduSubject, oneSubject);

            finalSubjectList.add(oneSubject);

            // 4. 封装所有二级分类
            // 在一级分类循环里面遍历查询出来的所有二级分类
            // 创建list集合封装每个一级分类的二级分类
            List<TwoSubject> twoFinalSubjectList = new ArrayList<>();
            // 遍历耳机分类
            for (int m = 0; m < twoSubjectList.size(); m++) {
                EduSubject tSubject = twoSubjectList.get(m);
                // 判断二级分类属于哪个一级分类，二级分类的parentId和一级分类的id是否一样
                if (tSubject.getParentId().equals(eduSubject.getId())) {
                    // 把tSubject值复制到TwoSubject里面，放到twoFinalSubjectList里面
                    TwoSubject twoSubject = new TwoSubject();
                    BeanUtils.copyProperties(tSubject, twoSubject);
                    twoFinalSubjectList.add(twoSubject);
                }
            }
            //  把一级下面所有的二级分类放到一级分类的children里面去
            oneSubject.setChildren(twoFinalSubjectList);
        }
        return finalSubjectList;
    }
}
